WASHINGTON, Nov 23 (Reuters) - A deal between Iran and six major powers halts progress on Iran's nuclear program, including its Arak reactor, a senior U.S. official said on Saturday.

The official, speaking on condition of anonymity, said the deal would neutralize Iran's stockpile of 20 percent enriched uranium and calls for instrusive inspections.

The deal, reached in Geneva, has no recognition of an Iranian right to enrich uranium and sanctions would still be enforced, the official said.

(Reporting by Steve Holland; Editing by Peter Cooney)